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- create two classes - create an association - do undo - an error is thrown java.lang.NullPointerException at org.eclipse.papyrus.diagram.clazz.custom.helper.AssociationEndSourceLabelHelper.getUMLElement(AssociationEndSourceLabelHelper.java:45) at org.eclipse.papyrus.diagram.clazz.custom.policies.DisplayAssociationEndEditPolicy.getUMLElement(DisplayAssociationEndEditPolicy.java:145) at org.eclipse.papyrus.diagram.clazz.custom.policies.DisplayAssociationEndEditPolicy.removeAdditionalListeners(DisplayAssociationEndEditPolicy.java:345) at org.eclipse.papyrus.diagram.common.editpolicies.AbstractMaskManagedEditPolicy.deactivate(AbstractMaskManagedEditPolicy.java:93) at org.eclipse.gef.editparts.AbstractEditPart.deactivateEditPolicies(AbstractEditPart.java:306) at org.eclipse.gef.editparts.AbstractEditPart.deactivate(AbstractEditPart.java:294) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.deactivate(AbstractGraphicalEditPart.java:354) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.deactivate(GraphicalEditPart.java:315) at org.eclipse.gef.editparts.AbstractEditPart.deactivate(AbstractEditPart.java:292) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.deactivate(AbstractGraphicalEditPart.java:354) at org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart.deactivate(ConnectionEditPart.java:383) at org.eclipse.papyrus.diagram.clazz.custom.edit.part.AbstractAssociationEditPart.deactivate(AbstractAssociationEditPart.java:73) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.removeSourceConnection(AbstractGraphicalEditPart.java:816) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refreshSourceConnections(AbstractGraphicalEditPart.java:692) at org.eclipse.gmf.runtime.diagram.ui.editparts.ShapeNodeEditPart.handleNotificationEvent(ShapeNodeEditPart.java:227) at org.eclipse.papyrus.diagram.common.editparts.NodeEditPart.handleNotificationEvent(NodeEditPart.java:66) at org.eclipse.papyrus.diagram.common.editparts.UMLNodeEditPart.handleNotificationEvent(UMLNodeEditPart.java:94) at org.eclipse.papyrus.diagram.common.editparts.NamedElementEditPart.handleNotificationEvent(NamedElementEditPart.java:47) at org.eclipse.papyrus.diagram.common.editparts.ClassifierEditPart.handleNotificationEvent(ClassifierEditPart.java:50) at org.eclipse.papyrus.diagram.clazz.edit.parts.ClassEditPart.handleNotificationEvent(ClassEditPart.java:196) at org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart.notifyChanged(GraphicalEditPart.java:1438) at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.fireNotification(DiagramEventBroker.java:500) at org.eclipse.gmf.runtime.diagram.core.listener.DiagramEventBroker.resourceSetChanged(DiagramEventBroker.java:395) at org.eclipse.gmf.runtime.diagram.ui.DiagramEventBrokerThreadSafe.resourceSetChanged(DiagramEventBrokerThreadSafe.java:73) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl$1.run(TransactionalEditingDomainImpl.java:781) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.postcommit(TransactionalEditingDomainImpl.java:771) at org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.deactivate(TransactionalEditingDomainImpl.java:543) at org.eclipse.emf.transaction.impl.TransactionImpl.close(TransactionImpl.java:712) at org.eclipse.emf.transaction.impl.TransactionImpl.commit(TransactionImpl.java:474) at org.eclipse.emf.workspace.AbstractEMFOperation.undo(AbstractEMFOperation.java:372) at org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doUndoWithResult(CompositeCommand.java:622) at org.eclipse.gmf.runtime.common.core.command.AbstractCommand.undo(AbstractCommand.java:216) at org.eclipse.gmf.runtime.common.core.command.CompositeCommand.doUndoWithResult(CompositeCommand.java:622) at org.eclipse.gmf.runtime.common.core.command.AbstractCommand.undo(AbstractCommand.java:216) at org.eclipse.core.commands.operations.DefaultOperationHistory.doUndo(DefaultOperationHistory.java:415) at org.eclipse.core.commands.operations.DefaultOperationHistory.undo(DefaultOperationHistory.java:1280) at org.eclipse.ui.operations.UndoActionHandler.runCommand(UndoActionHandler.java:78) at org.eclipse.ui.operations.OperationHistoryActionHandler$4.run(OperationHistoryActionHandler.java:311) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372) at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507) at org.eclipse.ui.internal.operations.TimeTriggeredProgressMonitorDialog.access$6(TimeTriggeredProgressMonitorDialog.java:1) at org.eclipse.ui.internal.operations.TimeTriggeredProgressMonitorDialog$2.run(TimeTriggeredProgressMonitorDialog.java:203) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.internal.operations.TimeTriggeredProgressMonitorDialog.run(TimeTriggeredProgressMonitorDialog.java:216) at org.eclipse.ui.operations.OperationHistoryActionHandler.run(OperationHistoryActionHandler.java:326) at org.eclipse.gmf.runtime.common.ui.action.actions.global.GlobalUndoAction.doRun(GlobalUndoAction.java:245) at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.run(AbstractActionHandler.java:359) at org.eclipse.gmf.runtime.common.ui.action.ActionManager.run(ActionManager.java:229) at org.eclipse.gmf.runtime.common.ui.action.AbstractActionHandler.runWithEvent(AbstractActionHandler.java:377) at org.eclipse.ui.actions.RetargetAction.runWithEvent(RetargetAction.java:230) at org.eclipse.jface.commands.ActionHandler.execute(ActionHandler.java:119) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:468)
When you create an association, if you undo the creation, the association is deleted from the model but not the graphical link.
It solves and tested
